Android Notification

Manifest.permission.POST_NOTIFICATIONSが必要になりました。

private fun showNotification() {
        // 通知をタップしたら、SubActivityを表示するためのintent
        val intent = Intent(this, SubActivity::class.java).apply {
            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
        }
        val pendingIntent: PendingIntent = PendingIntent.getActivity(
            this,
            0,
            intent,
            PendingIntent.FLAG_ONE_SHOT or PendingIntent.FLAG_IMMUTABLE
        )

        val builder = NotificationCompat.Builder(this, "channelId")
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setContentTitle("タイトル")
            .setContentText("テキスト")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true)

        val nm = NotificationManagerCompat.from(this)
        if (ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.POST_NOTIFICATIONS
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            return
        }

        nm.notify(0, builder.build())